By mail: Send your payment with the detachable part of your billing statement. The address is listed on the statement. By phone: We're here to help. Call customer service at 1-844-373-0871. You can reach us Monday through Thursday, 8 a.m. - 7 p.m., and Friday, 8 a.m. - 6 p.m. We accept debit cards and MasterCard, VISA, Discover and American ....